Star forming gas clouds emit a very narrow wavelength range of radio waves, and this could be used to measure their Doppler shift, how quickly they were moving toward or away from us.

恒星形成气体云发射出长范围非常窄的无线，可以用来测量它们的多普勒频移，即它们向我们移动或远离我们的速度。

The stars Slipher looked at showed unmistakable signs of a Doppler shift, the same mechanism behind that distinctive stretched-out yee-yummm sound cars make as they flash past on a racetrack.

斯莱弗发现，些恒星明确显示出一种多普勒频移的迹象，跟赛车场上飞驰而过的汽车发出的那种贯而又特有的“嚓——嗖”的声音属于同一机制。

While we may not see that motion directly, if we take spectra of their light, breaking it up into individual narrow colors, we can see the Doppler shift in their spectra.

虽然我们可能无法直接看到种运动，但我们把它们的光谱分解成单独的窄色，我们可以看到在它们光谱中的多普勒频移。

If we know the planets' mass from the star's Doppler shift, we can use the planet's size to calculate its density.

我们通过恒星的多普勒频移知道行星的质量，我们就可以用行星的大小来计算它的密度。

That means that its light will undergo a Doppler shift, and that can be detected.

意味着它的光会经历多普勒频移，并且可以被探测到。

Another way is to measure the Doppler shift in a star's light due to reflexive motion as the planet orbits.

另一种方法是测量恒星光线的多普勒频移，种频移是由行星绕轨道运行时的自反运动引起的。

For more than a decade, until others began to believe Slipher's ideas and understand the implications arising from them, He was virtually the only person investigating the Doppler shifts of spiral nebulae.

十多年来， 直到其他人开始相信斯莱弗的观点并理解其蕴含的意义，他几乎是唯一一位研究螺旋星云多普勒频移的人。

Frequency shifting means that we adjust the frequency, and keying means that a 1 is assigned to one frequency and a 0 to another, just like our traffic light colors.

频移意味着我们调整频率，而键控则表示将1分配给一个频率， 将0分配给另一个频率，就像我们的交通灯颜色一样。

The stars Slipher looked at showed unmistakable signs of a Doppler shift.

斯莱弗所观察的恒星显示出明显的多普勒频移迹象。

Doppler shifts had been measured for astronomical bodies before, but shifts of this size were unprecedented.

此前， 天文学界已对天体进行了多普勒频移的测量，但此巨大的频移却是前所未见的。